A father has been found guilty of murdering his seven-week-old son when he was left alone with him for just 20 minutes.

Kieron Hutchinson suffered catastrophic brain damage when he was left with his father Ian Hutchinson while his mother and grandmother went out shopping.

The trial at Sheffield Crown Court heard that the defendant may have inflicted the fatal injuries out of frustration because he did not have everything he needed to change his son's nappy.

The jury found Hutchinson, 24, of Elizabeth Street, Goldthorpe, Barnsley, South Yorkshire, guilty of murder.

The court heard that the defendant was left alone with Kieron on September 3 last year after his wife Rebecca Hutchinson and his mother Georgina Hutchinson went to the supermarket.

He told doctors and police he had begun to change his son after the women left the house but found there were no wipes in the changing bag and rang his wife to tell her this. Hutchinson told police that his son then became upset, coughed, went quiet and then stopped breathing.

Paramedics were called and Kieron was taken to Sheffield Children's Hospital, where he died four days later.

The baby suffered bleeding eyes and a seven-and-a-half centimetre skull fracture - injuries which must have been caused by an impact with a hard object and violent shaking.

Prosecutor Bryan Cox QC said: "What precisely caused the defendant to inflict such serious injury to Kieron is not entirely clear. It may have been something as trivial as a sense of frustration that he'd been alone with Kieron without the wherewithal to change his nappy."

Hutchinson will be sentenced at Sheffield Crown Court on Monday December 12.